Research Interests:
Research Interests:
The subject of on-line detection of rotor cage faults in three-phase induction motors is discussed, and a noninvasive approach, based on computer-aided monitoring of the stator current Park's vector, is introduced, Both simulation and... more
The subject of on-line detection of rotor cage faults in three-phase induction motors is discussed, and a noninvasive approach, based on computer-aided monitoring of the stator current Park's vector, is introduced, Both simulation and laboratory test results demonstrate the effectiveness of the proposed technique, for detecting broken rotor bars or end-rings in operating three-phase induction machines. On-site tests conducted in a power plant, using the diagnostic instrumentation system developed, are also reported
Research Interests: Computational Modeling, Fault Detection, Energy Conversion, Power Plant, Fault diagnosis, and 11 moreFrequency, Line Detection, Information Assurance and Security, System Development, Voltage, Induction machine, Induction Motor, Signal to Noise Ratio, Laboratory Tests, Electrical And Electronic Engineering, and Site testing
This paper presents the development of a simulation model of a matrix converter drive with the aim to diagnose faults in the converter. Using a model developed in Simulink environment, simulation results were obtained demonstrating that... more
This paper presents the development of a simulation model of a matrix converter drive with the aim to diagnose faults in the converter. Using a model developed in Simulink environment, simulation results were obtained demonstrating that the occurrence of an open-circuit fault in one of the power switches of the matrix converter affects heavily the operation of the motor, leading
Research Interests:
This paper proposes a first diagnostic technique for the detection and location of open-circuit faults in the power switches of matrix converter drives. The proposed method relies on the continuous monitoring of the amplitude of the three... more
This paper proposes a first diagnostic technique for the detection and location of open-circuit faults in the power switches of matrix converter drives. The proposed method relies on the continuous monitoring of the amplitude of the three output error voltages and works in a two-stage approach. In a first stage, if an open-circuit fault arises in the power converter, the error voltage associated with the output phase which contains the faulty element will rise considerably, hence triggering the indication of the fault. In a second stage, the exact location of the faulty element across the faulty phase will be done by monitoring the output error voltage of that phase when the reference input current and output voltage vectors lie within specific combinations of sectors, according to a table constructed for this purpose. The simulation results demonstrate that the proposed diagnostic technique is effective in the detection and location of the faulty switch in a period of time as fast as one-eighteenth of the electrical period of the supply voltage of the converter and can be used independently of the type of load, both in steady-state and transient conditions.
Research Interests:
Research Interests:
Page 1. Diagnosis of Stator, Rotor and Airgap Eccentricity Faults in Three-Phase Induction Motors Based on the Multiple Reference Frames Theory SMA Cruz and AJM Cardoso Department of Electrical and Computer Engineering ...
Research Interests:
Research Interests:
Page 1. IEEE TRANSACTIONS ON ENERGY CONVERSION, VOL. 20, NO. 3, SEPTEMBER 2005 611 Multiple Reference Frames Theory: A New Method for the Diagnosis of Stator Faults in Three-Phase Induction Motors Sérgio ...
Research Interests:
Abstract The monitoring of power converters is critical for obtaining systems with self-diagnostic capabilities and fault-tolerant features. This paper presents an analytical work concerning the operation of matrix converters (MCs) under... more
Abstract The monitoring of power converters is critical for obtaining systems with self-diagnostic capabilities and fault-tolerant features. This paper presents an analytical work concerning the operation of matrix converters (MCs) under the presence of open-circuit ...
Research Interests:
Research Interests:
This paper exploits the use of the multiple reference frames theory for the diagnosis of stator faults in three-phase induction motors. A simplified mathematical model in d-q-0 axes, able to simulate the behavior of the motor in the... more
This paper exploits the use of the multiple reference frames theory for the diagnosis of stator faults in three-phase induction motors. A simplified mathematical model in d-q-0 axes, able to simulate the behavior of the motor in the presence of stator faults, allowed the development of some analytical relations between the d-q-0 current components in different reference frames. The use of the stationary reference frame, clockwise and counterclockwise synchronous reference frames, allows the extraction and manipulation of the information contained in the three motor supply currents in a way that the effects introduced by the fault are isolated and measured. A severity factor is defined, and simulation and experimental results demonstrate its high independence in relation to the working conditions of the motor such as the load level and unbalances in the voltage supply system.
Research Interests:
This paper describes the use of the extended Park's vector approach (EPVA) for diagnosing the occurrence of stator winding faults in operating three-phase synchronous and asynchronous motors. The major theoretical principles related with... more
This paper describes the use of the extended Park's vector approach (EPVA) for diagnosing the occurrence of stator winding faults in operating three-phase synchronous and asynchronous motors. The major theoretical principles related with the EPVA are presented and it is shown how stator winding faults can be effectively diagnosed by the use of this noninvasive approach. Experimental results, obtained in the laboratory, corroborate that these faults can be detected, in the EPVA signature, by the identification of a spectral component at twice the fundamental supply frequency. On-site tests, conducted in a power generation plant and in a cement mill, demonstrate the effectiveness of the EPVA in the detection of stator circuit faults in large industrial motors, rated up to 5 MW
Research Interests:
Research Interests:
This paper is devoted to the diagnosis of rotor faults in closed-loop induction motor drives. Different control strategies are studied, namely the direct torque control and the indirect rotor field oriented control. A detailed analysis of... more
This paper is devoted to the diagnosis of rotor faults in closed-loop induction motor drives. Different control strategies are studied, namely the direct torque control and the indirect rotor field oriented control. A detailed analysis of different motor/controller variables enlightens about the behavior of these systems under the presence of rotor faults. Numerous simulation results as well as experimental tests
Research Interests:
Research Interests:
Research Interests:
Research Interests:
The subject of on-line detection of rotor cage faults in three-phase induction motors is discussed, and a noninvasive approach, based on computer-aided monitoring of the stator current Park's vector, is introduced, Both simulation and... more
The subject of on-line detection of rotor cage faults in three-phase induction motors is discussed, and a noninvasive approach, based on computer-aided monitoring of the stator current Park's vector, is introduced, Both simulation and laboratory test results demonstrate the effectiveness of the proposed technique, for detecting broken rotor bars or end-rings in operating three-phase induction machines. On-site tests conducted in a power plant, using the diagnostic instrumentation system developed, are also reported
Research Interests: Computational Modeling, Fault Detection, Energy Conversion, Power Plant, Fault diagnosis, and 11 moreFrequency, Line Detection, Information Assurance and Security, System Development, Voltage, Induction machine, Induction Motor, Signal to Noise Ratio, Laboratory Tests, Electrical And Electronic Engineering, and Site testing
This paper deals with the use of the total instantaneous power spectral analysis for diagnosing the occurrence of rotor cage faults in operating three-phase induction motors. The theoretical principles directly related to the application... more
This paper deals with the use of the total instantaneous power spectral analysis for diagnosing the occurrence of rotor cage faults in operating three-phase induction motors. The theoretical principles directly related to the application of this diagnostic technique are described, emphasizing the role of parameters such as the magnetizing current, motor-load inertia, motor rating and load level, in the diagnostic process. Both simulation and laboratory tests results demonstrate the effectiveness of the total instantaneous power spectral analysis for diagnosing the presence of rotor cage faults. The development of a severity factor, in order to evaluate the extension of the fault, is reported, and it is shown how this severity factor is almost independent of parameters such as the magnetizing current, motor rating and motor-load inertia
Research Interests: Computational Modeling, Fault Detection, Energy Conversion, Power Plant, Fault diagnosis, and 11 moreFrequency, Line Detection, Information Assurance and Security, System Development, Voltage, Induction machine, Induction Motor, Signal to Noise Ratio, Laboratory Tests, Electrical And Electronic Engineering, and Site testing
This paper presents the development of a simulation model of a matrix converter drive with the aim to diagnose faults in the converter. Using a model developed in Simulink environment, simulation results were obtained demonstrating that... more
This paper presents the development of a simulation model of a matrix converter drive with the aim to diagnose faults in the converter. Using a model developed in Simulink environment, simulation results were obtained demonstrating that the occurrence of an open-circuit fault in one of the power switches of the matrix converter affects heavily the operation of the motor, leading
Research Interests:
Page 1. IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS, VOL. 40, NO. 5, SEPTEMBER/OCTOBER 2004 1349 Diagnosis of Stator Inter-Turn Short Circuits in DTC Induction Motor Drives Sérgio MA Cruz, Associate Member ...
Research Interests:
This paper proposes a first diagnostic technique for the detection and location of open-circuit faults in the power switches of matrix converter drives. The proposed method relies on the continuous monitoring of the amplitude of the three... more
This paper proposes a first diagnostic technique for the detection and location of open-circuit faults in the power switches of matrix converter drives. The proposed method relies on the continuous monitoring of the amplitude of the three output error voltages and works in a two-stage approach. In a first stage, if an open-circuit fault arises in the power converter, the error voltage associated with the output phase which contains the faulty element will rise considerably, hence triggering the indication of the fault. In a second stage, the exact location of the faulty element across the faulty phase will be done by monitoring the output error voltage of that phase when the reference input current and output voltage vectors lie within specific combinations of sectors, according to a table constructed for this purpose. The simulation results demonstrate that the proposed diagnostic technique is effective in the detection and location of the faulty switch in a period of time as fast as one-eighteenth of the electrical period of the supply voltage of the converter and can be used independently of the type of load, both in steady-state and transient conditions.
Research Interests:
In this paper, different diagnostic techniques are proposed for the diagnosis of rotor faults in field oriented controlled (FOC) induction motor drives. In particular, the applicability of the estimated rotor flux, the current error... more
In this paper, different diagnostic techniques are proposed for the diagnosis of rotor faults in field oriented controlled (FOC) induction motor drives. In particular, the applicability of the estimated rotor flux, the current error signals and the outputs of the current controllers of a FOC drive are analyzed. Some block diagrams are presented which can be used to establish useful
Research Interests:
Research Interests:
This paper presents a new method to diagnose open-circuit faults in matrix converters. The proposed method consists in the measurement and estimation, simultaneously, of the three output phase voltages of the matrix converter. Afterwards,... more
This paper presents a new method to diagnose open-circuit faults in matrix converters. The proposed method consists in the measurement and estimation, simultaneously, of the three output phase voltages of the matrix converter. Afterwards, three error voltage signals are generated, which will be subsequently modulated using the control signals of each bidirectional switch of the converter. The nine modulated error voltages thus obtained are then monitored continuously and averaged over a certain period of time. When the converter is in healthy conditions, the values obtained for these signals are small. If an open-circuit fault arises in one or more switches, the modulated signals assigned to the faulty switches increase beyond a certain threshold value, hence giving the indication of the faulty condition. The obtained results shown in the paper demonstrate the effectiveness and applicability of the proposed diagnostic approach for the detection of open-circuits faults in matrix converters whether it feeds an induction motor or a passive load. The main advantages of this new diagnostic approach are its fast fault detection capability and easiness of implementation, associated to the possibility of diagnosing the presence of more than one faulty switch at the same time.
Research Interests:
Page 1. Diagnosis of Stator, Rotor and Airgap Eccentricity Faults in Three-Phase Induction Motors Based on the Multiple Reference Frames Theory SMA Cruz and AJM Cardoso Department of Electrical and Computer Engineering ...
Research Interests:
Research Interests:
Metallized polypropylene film capacitors (MPPF) are a very interesting alternative to electrolytic capacitors, because they can withstand much higher levels of surge voltage, very high RMS currents, and offer longer lifetimes. This paper... more
Metallized polypropylene film capacitors (MPPF) are a very interesting alternative to electrolytic capacitors, because they can withstand much higher levels of surge voltage, very high RMS currents, and offer longer lifetimes. This paper analyses the lifetime of MPPF capacitors present in the DC link of a single-phase regenerative induction motor (IM) drive. The system under analysis contains a single-phase active
Research Interests:
Page 1. IEEE TRANSACTIONS ON ENERGY CONVERSION, VOL. 20, NO. 3, SEPTEMBER 2005 611 Multiple Reference Frames Theory: A New Method for the Diagnosis of Stator Faults in Three-Phase Induction Motors Sérgio ...
Research Interests:
Research Interests:
Abstract The monitoring of power converters is critical for obtaining systems with self-diagnostic capabilities and fault-tolerant features. This paper presents an analytical work concerning the operation of matrix converters (MCs) under... more
Abstract The monitoring of power converters is critical for obtaining systems with self-diagnostic capabilities and fault-tolerant features. This paper presents an analytical work concerning the operation of matrix converters (MCs) under the presence of open-circuit ...
Research Interests:
Research Interests:
Research Interests:
This paper exploits the use of the multiple reference frames theory for the diagnosis of stator faults in three-phase induction motors. A simplified mathematical model in d-q-0 axes, able to simulate the behavior of the motor in the... more
This paper exploits the use of the multiple reference frames theory for the diagnosis of stator faults in three-phase induction motors. A simplified mathematical model in d-q-0 axes, able to simulate the behavior of the motor in the presence of stator faults, allowed the development of some analytical relations between the d-q-0 current components in different reference frames. The use of the stationary reference frame, clockwise and counterclockwise synchronous reference frames, allows the extraction and manipulation of the information contained in the three motor supply currents in a way that the effects introduced by the fault are isolated and measured. A severity factor is defined, and simulation and experimental results demonstrate its high independence in relation to the working conditions of the motor such as the load level and unbalances in the voltage supply system.
Research Interests:
The subject of on-line detection of rotor cage faults in three-phase induction motors is discussed, and a noninvasive approach, based on computer-aided monitoring of the stator current Park's vector, is introduced, Both simulation and... more
The subject of on-line detection of rotor cage faults in three-phase induction motors is discussed, and a noninvasive approach, based on computer-aided monitoring of the stator current Park's vector, is introduced, Both simulation and laboratory test results demonstrate the effectiveness of the proposed technique, for detecting broken rotor bars or end-rings in operating three-phase induction machines. On-site tests conducted in a power plant, using the diagnostic instrumentation system developed, are also reported
Research Interests: Computational Modeling, Fault Detection, Energy Conversion, Power Plant, Fault diagnosis, and 11 moreFrequency, Line Detection, Information Assurance and Security, System Development, Voltage, Induction machine, Induction Motor, Signal to Noise Ratio, Laboratory Tests, Electrical And Electronic Engineering, and Site testing
This paper describes the use of the extended Park's vector approach (EPVA) for diagnosing the occurrence of stator winding faults in operating three-phase synchronous and asynchronous motors. The major theoretical principles related with... more
This paper describes the use of the extended Park's vector approach (EPVA) for diagnosing the occurrence of stator winding faults in operating three-phase synchronous and asynchronous motors. The major theoretical principles related with the EPVA are presented and it is shown how stator winding faults can be effectively diagnosed by the use of this noninvasive approach. Experimental results, obtained in the laboratory, corroborate that these faults can be detected, in the EPVA signature, by the identification of a spectral component at twice the fundamental supply frequency. On-site tests, conducted in a power generation plant and in a cement mill, demonstrate the effectiveness of the EPVA in the detection of stator circuit faults in large industrial motors, rated up to 5 MW
Research Interests:
This paper presents the development of a simulation model of a matrix converter drive with the aim to diagnose faults in the converter. Using a model developed in Simulink environment, simulation results were obtained demonstrating that... more
This paper presents the development of a simulation model of a matrix converter drive with the aim to diagnose faults in the converter. Using a model developed in Simulink environment, simulation results were obtained demonstrating that the occurrence of an open-circuit fault in one of the power switches of the matrix converter affects heavily the operation of the motor, leading
Research Interests:
Research Interests:
This paper proposes a first diagnostic technique for the detection and location of open-circuit faults in the power switches of matrix converter drives. The proposed method relies on the continuous monitoring of the amplitude of the three... more
This paper proposes a first diagnostic technique for the detection and location of open-circuit faults in the power switches of matrix converter drives. The proposed method relies on the continuous monitoring of the amplitude of the three output error voltages and works in a two-stage approach. In a first stage, if an open-circuit fault arises in the power converter, the error voltage associated with the output phase which contains the faulty element will rise considerably, hence triggering the indication of the fault. In a second stage, the exact location of the faulty element across the faulty phase will be done by monitoring the output error voltage of that phase when the reference input current and output voltage vectors lie within specific combinations of sectors, according to a table constructed for this purpose. The simulation results demonstrate that the proposed diagnostic technique is effective in the detection and location of the faulty switch in a period of time as fast as one-eighteenth of the electrical period of the supply voltage of the converter and can be used independently of the type of load, both in steady-state and transient conditions.
Research Interests:
This paper is devoted to the diagnosis of rotor faults in closed-loop induction motor drives. Different control strategies are studied, namely the direct torque control and the indirect rotor field oriented control. A detailed analysis of... more
This paper is devoted to the diagnosis of rotor faults in closed-loop induction motor drives. Different control strategies are studied, namely the direct torque control and the indirect rotor field oriented control. A detailed analysis of different motor/controller variables enlightens about the behavior of these systems under the presence of rotor faults. Numerous simulation results as well as experimental tests
Research Interests:
Research Interests:
Research Interests:
Page 1. Diagnosis of Stator, Rotor and Airgap Eccentricity Faults in Three-Phase Induction Motors Based on the Multiple Reference Frames Theory SMA Cruz and AJM Cardoso Department of Electrical and Computer Engineering ...
Research Interests:
This paper deals with the use of the total instantaneous power spectral analysis for diagnosing the occurrence of rotor cage faults in operating three-phase induction motors. The theoretical principles directly related to the application... more
This paper deals with the use of the total instantaneous power spectral analysis for diagnosing the occurrence of rotor cage faults in operating three-phase induction motors. The theoretical principles directly related to the application of this diagnostic technique are described, emphasizing the role of parameters such as the magnetizing current, motor-load inertia, motor rating and load level, in the diagnostic process. Both simulation and laboratory tests results demonstrate the effectiveness of the total instantaneous power spectral analysis for diagnosing the presence of rotor cage faults. The development of a severity factor, in order to evaluate the extension of the fault, is reported, and it is shown how this severity factor is almost independent of parameters such as the magnetizing current, motor rating and motor-load inertia
Research Interests: Computational Modeling, Fault Detection, Energy Conversion, Power Plant, Fault diagnosis, and 11 moreFrequency, Line Detection, Information Assurance and Security, System Development, Voltage, Induction machine, Induction Motor, Signal to Noise Ratio, Laboratory Tests, Electrical And Electronic Engineering, and Site testing
Research Interests:
Page 1. IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS, VOL. 40, NO. 5, SEPTEMBER/OCTOBER 2004 1349 Diagnosis of Stator Inter-Turn Short Circuits in DTC Induction Motor Drives Sérgio MA Cruz, Associate Member ...
Research Interests:
Page 1. IEEE TRANSACTIONS ON ENERGY CONVERSION, VOL. 20, NO. 3, SEPTEMBER 2005 611 Multiple Reference Frames Theory: A New Method for the Diagnosis of Stator Faults in Three-Phase Induction Motors Sérgio ...
Research Interests:
In this paper, different diagnostic techniques are proposed for the diagnosis of rotor faults in field oriented controlled (FOC) induction motor drives. In particular, the applicability of the estimated rotor flux, the current error... more
In this paper, different diagnostic techniques are proposed for the diagnosis of rotor faults in field oriented controlled (FOC) induction motor drives. In particular, the applicability of the estimated rotor flux, the current error signals and the outputs of the current controllers of a FOC drive are analyzed. Some block diagrams are presented which can be used to establish useful
Research Interests:
This paper presents a new method to diagnose open-circuit faults in matrix converters. The proposed method consists in the measurement and estimation, simultaneously, of the three output phase voltages of the matrix converter. Afterwards,... more
This paper presents a new method to diagnose open-circuit faults in matrix converters. The proposed method consists in the measurement and estimation, simultaneously, of the three output phase voltages of the matrix converter. Afterwards, three error voltage signals are generated, which will be subsequently modulated using the control signals of each bidirectional switch of the converter. The nine modulated error voltages thus obtained are then monitored continuously and averaged over a certain period of time. When the converter is in healthy conditions, the values obtained for these signals are small. If an open-circuit fault arises in one or more switches, the modulated signals assigned to the faulty switches increase beyond a certain threshold value, hence giving the indication of the faulty condition. The obtained results shown in the paper demonstrate the effectiveness and applicability of the proposed diagnostic approach for the detection of open-circuits faults in matrix converters whether it feeds an induction motor or a passive load. The main advantages of this new diagnostic approach are its fast fault detection capability and easiness of implementation, associated to the possibility of diagnosing the presence of more than one faulty switch at the same time.